Solve 2020 day 12

2020/12_navigation.py

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+#!/usr/bin/env python3
+import sys
+
+WIND_DIRS = {'N': (0, 1), 'S': (0, -1), 'E': (1, 0), 'W': (-1, 0)}
+
+def navigate(instructions, waypoint):
+    x = y = 0
+    dx, dy = (10, 1) if waypoint else WIND_DIRS['E']
+
+    for inst, param in instructions:
+        if inst == 'L':
+            for i in range(param // 90):
+                dx, dy = -dy, dx
+        elif inst == 'R':
+            for i in range(param // 90):
+                dx, dy = dy, -dx
+        elif inst == 'F':
+            x += dx * param
+            y += dy * param
+        else:
+            wdx, wdy = WIND_DIRS[inst]
+            if waypoint:
+                dx += wdx * param
+                dy += wdy * param
+            else:
+                x += wdx * param
+                y += wdy * param
+
+    return abs(x) + abs(y)
+
+instructions = [(line[0], int(line[1:])) for line in sys.stdin]
+print(navigate(instructions, False))
+print(navigate(instructions, True))

2020/input/12

@@ -0,0 +1,783 @@
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